I think what Alvin is trying to say is that there's no public record of any transaction for 0.075BTC going to that address.  But perhaps you were just ballparking the amount, or perhaps you're referring to the sum of more than one transaction.  In any case, you'll want to send the transaction id(s) to support@primedice.com.  If that's really your PD deposit address, they'll credit your account if they got the money.  You don't need to worry, but you may have to be persistent, PD support is notoriously slow/backlogged.